Jig grinder



H. E. DURKEE July 15, 1952 JIG GRINDER 9 Sheets-Shes?l 2' Filed Sept. l5, 1948 nvVENToR. i/e/zly E. zz/ke H. E. DURKEE July 15, 1952 J IG GRINDER 9 Sheets-Sheet 5 Filed Sept. 15, 1948 y m y E T N m V mm H. E. DURKEE v July 15, 1952 J IG GRINDER `9 sheets-sheet 4 Filed sept. 15, 194:3

l V,Ils/VENTOR. Wale/yi'. zzlkee BY Ura/wwwA H. E. DURKEE July 15, 1952 JIG GRINDER 9 Sheets-Sheet 5 Filed Sept. 15, 1948 e e 4m a M4 July 15, 1952 H. E DURKE JIG CRINDER Filed Sept. 15, 1948 9 Sheets-Sheet 6 July 15, 1952 v H. E. DURKEE JIG GRINDER Filed Sept. 15, 1948 9 Sheets-Sheet 7 MWL,

INVENTOR f- Hehya/ee ATTORNEY IIE. J

July 15', 1952 kH. E. DURKEE JIG GRINDER 9 Sheets-Sheew. 8

Filed Sept. l5, 1948 H mb. E `m wlw Patented July 15, '1952* J IG GRINDER Henry E. Durkee, Manchester, Conn., assignor to .-Nlles-Bement-Pond Company, West Hartford,

Conn., a corporation of New JerseyA Application September 15, 1948, Serial-No. 49,359

Claims. l

This invention relates to grinding machines and particularly toa precision grinding machine adapted for grinding internal cylindrical and conical surfaces of varying diameter.

More particularly theinvention relates to an internal or hole grinding machine adapted to grind tool locating holes in hardened plates forming parts of drill positioning, or other types of jigs and iixtures, the material of which the plate is made being unadapted -for conventional precision boring or drilling operations.

More specically the invention relates to an internal grinding machine of the planetary type in which the grinding wheel, in addition to rotation about the axis of its own spindle, is revolved about an axis parallel thereto, the distance between these axes being manually adjustable at any time during the grinding operation to vary the diameter of the hole being ground.

A feature of importance of the invention is that the grinding wheel is rotatably mounted on the lower end of a spindle forming an extension of the armature shaft of a small high speed electric motor mountedwithin a suitable head, the head carrying the motor and spindle being laterallyl adjustable within and revolvable about the axis of a cylindrical slide on the lower end of which it is mounted, the reciprocatory movements of the slide being parallel to the axis about which the head and spindle revolve in any lateral adjustment of the head and within a rotatable trunnion.

A primary object of the invention is to provide means for reciprocating the slide carrying the tool head between adjustable limited vertical positions while the head carrying the grinding wheel is being revolved about the axis of its supporting member within the slide and while the grinding spindle is being rotated by its motor about its own axis.

Another object of the invention that is important is that the lateral adjustments of the grinding wheel and its spindle to vary the diameter of the hole being ground may be made at any time during the grinding operation to vary the size of the hole being ground, and thatthe vertical-'movements of the slide and the current supply to the wheel motor is notinterrupted by adjustments of the wheel spindle.

And finally it is an. object to provide angular adjustments for the vertically` slidable member within the rotating supportingcarriage for the purpose of grinding conical holes.Y I Y The Vobjects and features `lenumerated above are incorporated, in the embodiment of the invention illustrated in the drawings, in a machine tool the wheel spindle of which is vertical and the work supporting table for the machine tool is movable to predetermined precise positions in directions at right angles to each other in a horizontal plane.

With the above and other objects in View the invention may include thefeatures of construction and operation setA forth in the following specication and illustrated in the accompanying drawings. v

In the accompanying drawings annexed hereto and forming a part of this specification, Ihave shown the invention embodied in a precision hole grinding machine of large size and for a wide range of hole diameters, but it will be understood that the invention can be'otherwise embodied and that the drawings are not to be construed as defining or limiting the scope of the invention, the claims appended tothis specication being relied upon for that purpose.

In the drawings:

Figure 1 is an outside view in front elevation of a complete grinding machine embodying the present invention.

Fig. 2 is a similar view in side elevation of the machine shown in Fig. 1, the view being taken from the right. n Y

Fig. 3 is a side elevation partly in section showing portions of the mechanism for laterally adjusting the grinding wheel head.

Fig. 3a is a section showing the manual means to actuate the wheel feeding mechanism. y

Fig. 4 is a central vertical sectional view of parts shown in Fig. 3.

Fig. 5 is a vertical sectional view of the upper portion of the vertically movable wheel head spindle and its supporting and rotating means, showing also the angular adjustment for the vertically movable spindle within the trunnion.

Fig. 6 is a partially broken away view of the lower end of the wheel headgspindle, the wheel headrotating motor, and wheel spindle.

Fig.-7 is another view of the parts shown in Fig. 6, showing the lateral adjusting means for the grinding wheelhead.n l 4 Y Fig. 8 is a side elevation of some of the parts yshown in Fig. 4.

Fig. 9 is a sectional view of parts shown in Fig. 5, the section being'taken at 90 from that I in Fig. 5. d Y y Fig. 10 is a vertical sectionalview of the means to raise and lower the wheelv and its attached partap4 Frictia:

In the above-mentioned drawings, I have shown but one embodiment of the invention which is now deemed preferable, but it is to be understood that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

Briefly, and in its preferred aspect, the invention may include the following principal parts: First, a base having a column rigidly xed at one side thereof; second, a work supporting table movable on said base in a horizontal plane in directions at right angles to each other; third, precision locating means for said table in its directions of movement; fourth, a vertically adjustable carriage on said column; fth, means to adjust said carriage to positions accommodating the machine for work of various heights; sixth, a trunnion within said carriage rotatable upon a vertical central axis; seventh, a spindle within the trunnion supported within a sleeve which may be tilted relativev to the axis of rotation of the runnion having a wheel supporting head at its lower end laterally adjustable relative to the axis of rotation of said trunnion; eighth, means to tilt said sleeve and its spindle to slightly oblique adjustable positions relative to the axis of rotation of said trunnion; ninth, a motor mounted within said'head having a vertically disposed armature shaft; tenth, a grinding wheel mounted on the extended lower end of said armature shaft; eleventh, circuits and controlling means for said motor; twelfth, manually operated means to adjustthe lateral'position of said motor and spindle during reciprocating movements of the head and rotating movements of the trunnion; and thirteenth, means to rotate the trunnion about its vertical axis to revolve the grinding head and wheel motor in circles of predetermined radii.

Referring more in detail to the figures of the drawing, a preferred-embodiment of the invention is shown in which a base I having a vertically extending column I2 at` one side supports a vertically adjustable carriage I4 upon suitable guideways I5 formed on the column I2. Within this carriage I4 is a trunnion I6 rotatably mounted on a vertical central axis preferably on spaced ball bearings I8 as shown.

The trunnion is slowly rotated by means presently to be described and supports a vertically movable spindle or slidetoY which the wheel head is attached at its lower end. The spindle is movable up and down by mechanical means during operation to traverse the wheel along the hole being bored.

Means to raise and lower the carriage I4 and to slowly rotate the trunnion I6 about its axis will presently be described. Within the trunnion I6 is an elongated sleeve 20 mounted for tilting movement about alined centers 22 near its lower end and within which the spindle 26 is slidable (see Figs. 5 and 9). To adjust the'oblique position of this sleeve 28 and spindle 26 relative to the axis of trunnion I6 an adjusting screw 24 is attached to the sleeve adjacent its upper end and engaging a connection on the trunnion I6. By rotating a nut 21 forming part of this connection the sleeve 28 may be accurately adjusted to any tilted position as indicated bythe scale 25. To clamp the sleeve 2 0 in its adjusted tilted position, clamping bolts 28, one only of which is shown, may be mounted on fixed members secured to the top surface of the trunnion I6.

The sleeve 20 pivots about the axis of alined pins 22 the pointed inner ends of which'enter conical recesses within the sleeve. To adjust the pins 22 threaded screws 3| may engage their outer ends and provide axial adjustment of the pins 22 to firmly support the sleeve 20 and its attached parts.

The carriage I4, as stated above, is vertically movable on the column I2 and for adjusting the carriage to different vertical positions a small individual motor 40 (see Fig. 1) is provided to rotate a small pinion 42 rotatably mounted in the column I2 and in engagement with a vertical rack 44. Clamping means may be provided to secure the carriage I4 in any adjusted vertical position on the column I2 and during grinding operations the-carriage I4 is preferably retained in fixed vertical position.

Within the sleeve 20 operates the upper extended end of spindle 26 for a grinder head 28 presently to be more fully described. The spindle 26 for the head 28 is splined as shown at 33 in Fig. 5 to the sleeve 20 and coaxial therewith, and is vertically movable between adjustable limiting positions by suitable power means. Anti-friction beearings 30 may be provided engaging the walls of the spindle or supporting member 26 for the head 28 and the sleeve 20. Within the head 28 is the wheel rotating motor 58 mounted for precision manual transverse adjustments during operation and having an abrasive wheel 52 on the lower end of its motor spindle preferably forming the extended shaft of the armature of the wheel motor. These elements will now be described.

As shown most clearly in Figs. 6 and 7, the motor 50 is laterally adjustable upon suitable straight line anti-friction bearings 54 formed on the lower surface of the head 28. To effect lateral adjustments of the motor 50 and its spindle to feed the abrasive wheel 52 laterally relative to the work, its supporting plate 56 carries a fixed screw 58 extending in a central horizontal plane and engaged by a rotatable nut 6G. The axis of this fixed screw 58 intersects the axis of the spindle 26. The nut 60 is retained against axial movement relative to the head 28 within the lower end ofthe spindle and is provided with bevel gear teeth. Meshing with these gear teeth on nutl 60 is another bevel gear 62 rotating on a central vertical axis and housed within the member 216. Rotation of these gears B8 and 452 will therefore transversely adjust the wheel motor 50 and its abrasive wheel52. Connected to this gear It2 through suitable universal joints and an elongated shaft 63 is an operating gear 64, this latter gear, as shown in Fig. 3 and the diagram, Fig. 11, being at the upper end of the shaft 63. To rotate this gear 64 to rotate the nut 6U and laterally adjust the motor 50 during operations to feed the wheel 52 toward the surface of the hole by means of the screw 58, connections are provided presently to be described.

On a forwardly extending horizontal surface of the base I0 is provided a saddle 29 movable in a Vhorizontal plane on suitable ways directly toward and from the column I2. On the upper surface of the saddle 29 on suitable ways extending at right angles to the ways on which the saddle 29 operates is a transversely and horizontally movable table 35 on which work pieces may be mounted. Traversing and indicating means are provided for accurately positioning the saddle 29 and table 35 manually to successive positions for operations upon` different parts of a work piece (not shown) securedto said table 35. -As these positioning and indicating means for the saddleand table are or may be similar to -those l the saddle 23 may be moved toward and from the column I2 and by a second handwheel 39 at one side of the machine on the end of a screw 38 the table 3 5 may be moved laterally relative to the saddle 29. A A

With work pieces moved successively to different positions by adjustments of the saddle 29 and table as called for by the work piece being operated on, the wheel 52 can be moved up and down by movements of the slide '26 during rotation of the trunnion I6. During this operation the revolving movement of the wheel 52 can be adjusted to different radii to grind the holein the work piece to any desired diameter. y

These feeding movements of the wheel 152 are required during rotation of the trunnion I6 to revolve the wheel in planetary paths of slightly increasing radii. Connections are therefore provided .to a nxed position on the carriage yI4 so that .the operator may, as required, make'the necessary adjustments manually from this position. At the upper end of the sleeve |33 is a gear 46 concentric to gear 64 previously referred to and meshing with a smaller gear 66 on the lower end of a shaft 68 rotatably mounted within a planetary housing member 10. At the upper' end of this shaft 68 is a gear '|2 meshing with a gear i4 of equal size on a short shaft '|'6 within the housing member 'I0 of the planetary mechanism.

This-short shaft 'I6 carries a second gear 'I8 meshing with a larger gear 80 on the upper end of a sleeve 6 2 surrounding the first shaft 68. This sleeve 82 at its lower end carries a gear 84 meshing with the gear 64 on the upper end of the shaft 63. The ratios of the above gearing is such that with no rotary movement of the vplanetary housing member "I0 rotation of the trunnion I6 and the gear 46 will have no rotative effect upon the wheel adjusting shaft 63. Gears 46 and 64 will therefore rotate together without any relative rotation. If, however, rotation is imparted to the planetary housing 'I0 as by means of a gear 86 secured thereon, the wheel adjusting shaft 63 will be rotated relative to the trunnion |16. 'I'his movement will effect feeding movements of the wheel. To rotate the gear 86 on the planetary housing 'I0 a vertical shaft '85 having a gear 88 splined thereto at its upper end is drivingly connected to the gear 86. At the lower end of the shaft 85 is a manual operating means for slowly rotating the shaft. Preferably two speed ratios between the shaft 85 and hand wheel `89 are provided, one of which is through intermeshing helical gears l9| and the other through a worm and worm gear drive 93. By an intermediate clutch 81 on the shaft 85 a fast or slow driving connection is obtained.

Torotate the trunnion I6 about its axis to revolve the wheel 52 in a planetary path, the following mechanism is provided. On the trunnion I'S as shown in the diagram (Fig. l1) is a large gear 00 meshing with a pinion I02 on the upper end of a shaft 94. The lower end of this shaft 34 is provided with suitable clutches l96 and with a gear 38 meshing with a gear y|00 on the lower end of a vertical shaft I 02 extending alongside the trunnion I6. This shaft |02 at its upper end carries a bevel gear |04 meshing with a companion bevel gear on a horizontal shaft |06. At the opposite end of this latter shaft |06 connected throughsuitable gears l|08 is a vertical shaft ||0 alongside the column I2 andl connected through any form Vo-f speed change gearing I2 to the driving motor II4. A telescopic joint in one of the vertical shafts (notushown inthe diagram) permits adjustment ofthe carriage I4 andtrunnion I6 to different vertical positions without interruption ofthe rotating means.

` The Vmanual reciprocating means for the'head 50V and spindle 26 and parts connected thereto during operation and rotation of the trunnion I6 includes a rotatable nut |20 supported for rotation about a vertical screw |22 but retained against axial movement relative to the'head I1 movable withv spindle 26 within which it is mounted. Manual means are provided for rotating the nut |20 including agear |24 on the nut meshing witha gear |26 on the upper end of a vertical splined shaft |28. The lower end of this shaft |28 by meshing helical gears drivingly connects a forwardly extending shaft having a hand wheel at its forward end.

To reciprocate the head I1, wheel 50 and spindle 26 by power, means are provided for rotating the screw |22 engaged by the nut |20. The screw |22 is rotatably mounted and held against axial movement relative to the carriage I4, the trunnion I6 and parts supported thereby. .This screw |22 byA suitable connections including a spline shaft |30 and a speed changing mechanism (not shown) is rotated by a' motor alongside the column I2. Between the splined shaft |30 and its driving motor are bevel gears |40 connecting the shaft |30 to a horizontal shaft |42 which in turn is connected to the motor by vertical shaft |44. Gears |40 and shaft |42 are, as shown inFig. 10, housed within a member I3 fixed to the column To control the vertical movements of the head I'I, movements of the spindle 26 within the trunnion i6, the vertical movements of wheel 52, and also control the rotative movement of the trunnion I6, control stations |46 and |48 respectively are provided at a convenient position for the operator. y

To supply the motor 50 for the wheel 52 with current, leads |3| from any suitable source may be connected to slip rings |32 on the upper end of the sleeve |33 within head and rotating with the trunnion I6 and spindle 26. These rings I 32 are connected to the motor 50 by wires extending within the spindle 26 at one side of the shaft 63 for varying the lateral position vof 'themotor 50 and the wheel 52. To accommodate these lateral movements of the motor 50 the shaft 63 is made up of several lengths extending between suitable universal joints |34. And also to accommodate this movement of the Wheel and the tilting movement of the spindle 26 and its sleeve 20 there are provided universal joints |36 between the sleeve |33 and the spindle 26. By

this means the upper end of the rotating members, including the sleeve |33, are mounted within the upper end of the head for rotation on a Vfixed axis as shown in Fig. 4.

Y nion, angular adjusting means on said trunnion to tilt said spindle :about a horizontal axis in said trunnion to obliquepositions relative to the axis of rotation of said trunnion, a radially adjustable Wheel head supported at the lower end of spindle, manual means extending centrally through said trunnion and spindle to adjust the radial position of said wheel, a motor within said head and radially adjustable therewith, and

a grinding wheel driven by said motor.

2. An internal grinding machine comprising in combination,V a base, a work supporting table niovably mounted thereon, a column on said base, av carriage adjustable vertically on said column, a trunnion rotatably mounted within said ycarriage, a rotatable wheel head spindle axially and angularly adjustably mounted within said trunnion, angular adjusting means onsaidv trunnion to tilt said spindle Vabout a horizontal axis in said trunnion to oblique positions relative to the axis of rotation of said trunnion, a radially adjustable wheel head supported at the lower end of spindle, manual means extending centrally through saidV trunnion and, spindle to adjust the radial position of saidwheel, a motor within said head, and a grinding wheel on the armature shaft of said motor.

3. An internal grinding machine comprising in combination, a base, a work supporting table movably mounted thereon, a column on said base, avcarriage adjustable vertically on said column, a trunnion rotatably mounted on a fixed axis within said carriage, a rotatable wheel head spindle axially and angularly adjustably mounted within said trunnion, manually operated adjusting means on said trunnion to tilt said' spindle about a horizontal axis in said trunnion to oblique positions, a wheel head adjustably supported on transverse ways provided at the lower end of spindle, means to manually adjust said wheel head laterally along said ways during rotation of said spindle, said means including a planetary gear train driven by rotation of said trunnion, a vertical shaft extending through said spindle and driven thereby, and manual means to bodily rotate said planetary gearing about an axis parallel to said shaft to rotate said vertical shaft to effect said lateral adjustments of said wheel head.

fi. An internal grinding machine comprising in combination, a base, a work supporting table movably mounted" thereon, a column on said base, a carriage adjustable vertically Von said column, a trunnion rotatably mounted on a fixed axis within said carriage, a rotatable wheel head spindle axially and angularly'adjustably mounted within said trunnion, manually operated angular adjusting Ymeans ori-said trunnion for said spindle to oblique' posi-tions relative to the axis of rotation of said-trunnion, a wheel head adjustably supported on transverse Aways at the lower end of spindle and having a grinding'wheel spindle thereon, means'togrnanuallyadjust said wheel head laterallyalongfsaid ways during rotation of said spindle, sa-id 'means including a planetary gear train driven'by said trunnion rotation, a vertical shaft extending through said spindle and driven thereby and connected to the lateral adjusting means for said wheel head, a rotatably mounted casing enclosing said planetary gearing, and manual means to rotate said casing and planetary gearing about an axis parallel to said shaft and said vertical shaft about its own axis to eiect lateral adjustments of said head and wheel spindle.

5. An internal grinding machine comprising in combination, a base, a work supporting table movably mounted thereon, a 'column on said base, a carriage adjustable vertically on said column, a trunnion rotatably mounted within said carriage, a rotary wheel head spindle mounted for axial movement and Vangular adujstment within said trunnion, manually operated adjusting means on said trunnion to tilt saidA spindle about a horlzontalaxis in saidtrunnion tov predetermined angular positions relative to the axis of rotation of said trunnion, a laterally adjustable wheel head supported at the lower end of` said spindle on transverse ways provided therefor, means to manually adjust said Wheel head predetermined distances laterally from the axis of rotation of said spindle and during rotation of said spindle, a planetaryn gearing system in said wheel adjusting means, a Avertical shaft extending within said spindle to effect lateral movement of said Wheel, a rotatably mounted casing enclosing said gearing, means to rotate said planetary gearing by rotation of said trunnion during operation of the machine, said rotation of said trunnion maintaining said vertical shaft and wheel head in fixed lateral position relative to the axis of rotation of said shaft, and manual means connected to said casing to adjust the rotative position of said casing to rotate said vertical shaft relative to the trunnion rotation and vary the lateral adjustment of said wheel head.

HENRY E. DURKEE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,045,243 Zeitz Nov. 26, 1912 1,172,274 Gargan Feb. 22, 1916 1,527,357 Gray Feb. 24', 1925 1,839,253 Olofson Jan. 5, 1932 2,163,345 McMahon June 20, 1939 2,235,924 Gignoux Mar. 25, 1941 2,458,765 Bryant Jan. 11, 1949 FOREIGN PATENTSV Number y Country Date 135,918 Germany Nov. 21, 1902 

